Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Ocular Aberration(also: Optical Aberration, Wavefront Aberration)
- Ocular aberration refers to deviations in the way light is focused by the optical components of the eye (cornea and lens) compared to an ideal optical system. These aberrations distort the image formed on the retina and contribute to blurred or distorted vision. Lower-order…
- Optic Ataxia(also: Visuomotor Ataxia)
- A neurological condition characterised by impaired reaching for objects using visual guidance, despite having adequate vision and motor strength. People with optic ataxia can see an object and describe its location but struggle to accurately direct their hand toward it. This…
- Optic Flow(also: Visual Flow, Optical Flow)
- The pattern of apparent motion of objects, surfaces, and edges in a visual scene caused by relative movement between the observer and the scene. Optic flow provides critical information about self-motion, speed, direction, and the structure of the environment. It plays a key…
- Optic Nerve Hypoplasia(also: ONH)
- A congenital condition in which the optic nerve is underdeveloped, resulting in varying degrees of vision loss from mild visual impairment to complete blindness. It is one of the most common causes of visual impairment in children. People with optic nerve hypoplasia may…
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